[Nook Color General] forthenookie:
Here's my experience and benchmark results for the micro sd cards I have. Consistent with other's results, I purchased a SanDisk which gave significantly better results for small writes (about 35x better than my next best card). All tested with a cheap USB SD Card reader and SD adapter. Still waiting to receive my nook, but thanks to you guys I have a card I can use to play with CM7 when it gets here.

1. SanDisk 16GB Class 4 in retail packaging, SDSDQ-016G-A11M, 6 19659 05556 1, purchased 11/28 (on sale for $15) from Staples in store

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.289 MB/s
Sequential Write : 5.739 MB/s
Random Read 512KB : 17.759 MB/s
Random Write 512KB : 2.598 MB/s
Random Read 4KB (QD=1) : 2.928 MB/s [ 714.8 IOPS]
[B] Random Write 4KB (QD=1) : 1.209 MB/s [ 295.2 IOPS]
[/B] Random Read 4KB (QD=32) : 3.376 MB/s [ 824.2 IOPS]
[B] Random Write 4KB (QD=32) : 1.286 MB/s [ 313.8 IOPS]
[/B]
Test : 50 MB [E: 0.0% (0.0/14.8 GB)] (x9)
Date : 2011/11/29 18:51:48
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)

2. ADATA 8GB Class 10 micro SDHC

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.071 MB/s
Sequential Write : 13.170 MB/s
Random Read 512KB : 17.797 MB/s
Random Write 512KB : 1.355 MB/s
Random Read 4KB (QD=1) : 2.914 MB/s [ 711.3 IOPS]
[B] Random Write 4KB (QD=1) : 0.015 MB/s [ 3.7 IOPS]
[/B] Random Read 4KB (QD=32) : 3.134 MB/s [ 765.1 IOPS]
[B] Random Write 4KB (QD=32) : 0.034 MB/s [ 8.2 IOPS]
[/B]
Test : 50 MB [E: 0.0% (0.1/7879.0 MB)] (x3)
Date : 2011/11/29 17:48:53
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)

3. ADATA 4GB Class 2 micro SDHC

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 14.096 MB/s
Sequential Write : 4.882 MB/s
Random Read 512KB : 13.750 MB/s
Random Write 512KB : 0.723 MB/s
Random Read 4KB (QD=1) : 2.439 MB/s [ 595.4 IOPS]
[B] Random Write 4KB (QD=1) : 0.035 MB/s [ 8.6 IOPS]
[/B] Random Read 4KB (QD=32) : 2.593 MB/s [ 633.1 IOPS]
[B] Random Write 4KB (QD=32) : 0.037 MB/s [ 8.9 IOPS]
[/B]
Test : 50 MB [E: 0.0% (0.3/3751.0 MB)] (x3)
Date : 2011/11/29 18:05:08
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)

4. Kingston 2GB micro SDHC

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CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo
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* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 18.232 MB/s
Sequential Write : 6.695 MB/s
Random Read 512KB : 17.919 MB/s
Random Write 512KB : 2.007 MB/s
Random Read 4KB (QD=1) : 3.359 MB/s [ 820.0 IOPS]
[B] Random Write 4KB (QD=1) : 0.022 MB/s [ 5.4 IOPS]
[/B] Random Read 4KB (QD=32) : 3.701 MB/s [ 903.6 IOPS]
[B] Random Write 4KB (QD=32) : 0.027 MB/s [ 6.6 IOPS]
[/B]
Test : 50 MB [E: 71.4% (1344.3/1881.7 MB)] (x3)
Date : 2011/11/29 17:56:45
OS : Windows XP Home Edition SP3 [5.1 Build 2600] (x86)